WANT TO MAKE THE PERFECT CUP OF COFFE?
Here are 3 simple tips that will make a difference in every single cup you drink.
Espresso is coffee made by heating water to temperatures about 15 degrees below boiling, then forcing it through a compacted puck of very finely ground coffee beans at about 9 atmospheres of pressure. The reasons for the precise temperature, the compacted beans and the measurement of pressure all have to do with chemistry – the chemistry of the coffee beans and the chemical interactions between the beans and the hot water. The flavor of coffee comes from fats and proteins in the coffee beans. When the beans are mixed with hot water, those oils and proteins are released. The longer the water is in contact with the coffee, the more chemicals are washed out of them. If the water is too hot, the coffee can overcook and taste burnt. If it is too cold, the coffee can be watery and tasteless. If the water takes too long to get through the coffee, it can extract the more bitter tannins and other chemicals from the beans.
When water and coffee meet with all the variables at precisely the right measurements, the result is a cup of thick, rich, creamy brew with a complex flavor that resides as much in the foamy emulsion on top as it does in the liquid that sits beneath it.